Somewhere in a box in the garage, I have a tin of Dr. Rumney's mentholated snuff from the 1980s. I used it sparingly, just by squeezing the tin smartly and placing a hinge by a nostril. Then, a quick sniff up the other, before my head exploded. I believe that tin is a lifetime supply. It's safely stored, just waiting until I can talk someone else into trying it!